Add an option for using any HTTP authentication scheme, not only basic

This adds the configuration option http.authAny (overridable with
the environment variable GIT_HTTP_AUTH_ANY), for instructing curl
to allow any HTTP authentication scheme, not only basic (which
sends the password in plaintext).

When this is enabled, curl has to do double requests most of the time,
in order to discover which HTTP authentication method to use, which
lowers the performance slightly. Therefore this isn't enabled by default.

One example of another authentication scheme to use is digest, which
doesn't send the password in plaintext, but uses a challenge-response
mechanism instead. Using digest authentication in practice requires
at least curl 7.18.1, due to bugs in the digest handling in earlier
versions of curl.

Signed-off-by: Martin Storsjö <martin@martin.st>
Signed-off-by: Tay Ray Chuan <rctay89@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/Documentation/config.txt b/Documentation/config.txt
index b77d66da25bfb098c84f249cde721734e04b1b9d..a54ede350f9b7b7b5e64f3d69b348f227633b595 100644 (file)
--- a/Documentation/config.txt
+++ b/Documentation/config.txt
@@ -1158,6 +1158,13 @@ http.noEPSV::
        support EPSV mode. Can be overridden by the 'GIT_CURL_FTP_NO_EPSV'
        environment variable. Default is false (curl will use EPSV).
 
+http.authAny::
+       Allow any HTTP authentication method, not only basic. Enabling
+       this lowers the performance slightly, by having to do requests
+       without any authentication to discover the authentication method
+       to use. Can be overridden by the 'GIT_HTTP_AUTH_ANY'
+       environment variable. Default is false.
+
 i18n.commitEncoding::
        Character encoding the commit messages are stored in; git itself
        does not care per se, but this information is necessary e.g. when

diff --git a/http.c b/http.c
index fb0a97b3f9a49da1d21330cb35054698109a695f..aeb69b3f29e35f1171f259f9141f7fdae377c7bf 100644 (file)
--- a/http.c
+++ b/http.c
@@ -7,6 +7,10 @@ int active_requests;
 int http_is_verbose;
 size_t http_post_buffer = 16 * LARGE_PACKET_MAX;
 
+#if LIBCURL_VERSION_NUM >= 0x070a06
+#define LIBCURL_CAN_HANDLE_AUTH_ANY
+#endif
+
 static int min_curl_sessions = 1;
 static int curl_session_count;
 #ifdef USE_CURL_MULTI
@@ -36,6 +40,9 @@ static long curl_low_speed_time = -1;
 static int curl_ftp_no_epsv;
 static const char *curl_http_proxy;
 static char *user_name, *user_pass;
+#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
+static int curl_http_auth_any = 0;
+#endif
 
 #if LIBCURL_VERSION_NUM >= 0x071700
 /* Use CURLOPT_KEYPASSWD as is */
@@ -190,6 +197,12 @@ static int http_options(const char *var, const char *value, void *cb)
                        http_post_buffer = LARGE_PACKET_MAX;
                return 0;
        }
+#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
+       if (!strcmp("http.authany", var)) {
+               curl_http_auth_any = git_config_bool(var, value);
+               return 0;
+       }
+#endif
 
        /* Fall back on the default ones */
        return git_default_config(var, value, cb);
@@ -240,6 +253,10 @@ static CURL *get_curl_handle(void)
 #if LIBCURL_VERSION_NUM >= 0x070907
        curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
 #endif
+#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
+       if (curl_http_auth_any)
+               curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
+#endif
 
        init_curl_http_auth(result);
 
@@ -391,6 +408,11 @@ void http_init(struct remote *remote)
        if (getenv("GIT_CURL_FTP_NO_EPSV"))
                curl_ftp_no_epsv = 1;
 
+#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
+       if (getenv("GIT_HTTP_AUTH_ANY"))
+               curl_http_auth_any = 1;
+#endif
+
        if (remote && remote->url && remote->url[0]) {
                http_auth_init(remote->url[0]);
                if (!ssl_cert_password_required &&